"I [name] do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter. So help me God." ---Official FBI Oath of Office
Thesis
The FBI was formed in an effort to combat increasing levels of interstate crime, decrease the influence of American Gangsters, protect against threats of foreign espionage, and promote national security; which as a result has made American society noticeably safer and thus constituted a turning point in American history.